jock0909 Posted November 14, 2008 Share Posted November 14, 2008 I have a 2004 1.8 TDCI the battery light iluminates when driving (normally after about 30 minutes from start up) If you switch off the engine and start it up again the battery light goes off. the alternator has been changed but the problem still happens. Any suggestions would be great. Quote Link to comment Share on other sites More sharing options...
mintalkin Posted November 14, 2008 Share Posted November 14, 2008 i would start by checking that all the wireing and earth points are good and sound. Quote Link to comment Share on other sites More sharing options...
jocojohn Posted November 17, 2008 Share Posted November 17, 2008 Hi, My son had a similar problem with his 1.6 T reg focus, but the battery warning light would come on after about 15 seconds. After trying another battery and alternator we finally traced the fault to a break in the small red wire from the alternator to the underbonnet fuse box, F10 if I remember correctly. As your light stay off for much longer it may be high resistance in this wire or a tiny break that makes and break contact. John PS have you checked the aux belt tension. Quote Link to comment Share on other sites More sharing options...
jock0909 Posted November 18, 2008 Author Share Posted November 18, 2008 The belt tensioner is the automatic type and the tension is fine. You are probably correct about a broken wire switching the light on, everything else seems to work and the engine starts fine. although I have noticed with the dark evenings sometimes when the headlights are on the instrument lights pulse from dim to bright but it only happens occasionally while driving. I will have to check the wires. Quote Link to comment Share on other sites More sharing options...
andyjw Posted September 4, 2010 Share Posted September 4, 2010 The belt tensioner is the automatic type and the tension is fine. You are probably correct about a broken wire switching the light on, everything else seems to work and the engine starts fine. although I have noticed with the dark evenings sometimes when the headlights are on the instrument lights pulse from dim to bright but it only happens occasionally while driving. I will have to check the wires. Hi I know this thread is old, but I have this problem and I wondered if the fault was cures? Thanks in advance, Andy Quote Link to comment Share on other sites More sharing options...
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